Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1a2342b90e43aa…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 22:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3862e708ab97dfd53e64c17228742d28 SHA-1: 2eed37df322462ca0d88889730400463ac09e027 SHA-256: 7b1a2342b90e43aa65760946ee8be414af8b1a6813f9f4dac1aaa8d383ec199c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting it's used to redirect users to phishing or malware distribution sites. The presence of JavaScript indicates an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=song+title+wheel+of+fortune+4+words PDF link annotation
    • http://cjmfgx.morefriendship.com/upload/files/24820538029.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pinuzed.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2c49ceeb---32838371399.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48a4cd87e---62185586079.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xixedogofotonafatiputuj.pdfIn PDF document text
    • https://priscar.com/documents/files/xakosidamawofor.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/7795735954.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/11064640543.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/16066502797.pdfIn PDF document text
    • http://artediapharma.com/upload/files/pisibozerogapezotajerizi.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_922030744D5253E7.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/85896335825.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109141705595335.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/pifezosugoki.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/84456572636.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/65380455376.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161351c82c45f5---senukuzorikipofomi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/35600862264.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/68106239817.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613048e273885---88889914371.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/78026745493.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 18312 bytes
SHA-256: 95883da407779e5cbbf150ef1e05971b6a67de9b78b29cc87f2ddc0f7c67fc02
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 10812 bytes
SHA-256: 1e834314a59f5d4bc55b723b30a1150214ca3b4fd0582e9de20066f11892d020

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